DemoBook a demo

Vulnerability advisory

GHSA-pgm4-439c-5jp6

Rails has a possible XSS vulnerability in its Action Pack debug exceptions

Published Updated OSV record ↗

Also known as CVE-2026-33167

Severity
  • CVSS 4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U

Affected versions

actionpack RubyGems

All actionpack advisories →
AffectedFixed in
8.1.0 to before 8.1.2.18.1.2.1Advisories →
Also listed as affected (3)

Description

Impact

The debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (config.consider_all_requests_local = true), which is the default in development.

Releases

The fixed releases are available at the normal locations.

Credit

This issue was responsibly reported by Hackerone researcher fbettag.

References

  • Codex
  • Claude Code
  • VS Code
  • GitHub Copilot
  • Cursor
  • Cline
  • Windsurf
  • Google Anti-gravity
  • OpenCode
  • Pi
  • Gemini CLI
  • Hermes Agent
  • Zed
  • Junie
  • Qwen Code
  • Kiro
  • Kilo Code
  • Factory Droid

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